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<?php interface NodeInterface { public function eval() : int; } class Node implements NodeInterface { public int $value; public string $sign; public Node $rightChild; public Node $leftChild; public function eval() : int { if (null != $this->rightChild) { return $this->value; } switch ($this->sign) { case "+": return $this->leftChild->value + $this->rightChild->value; //... } } } $root = new Node(); $root->value = 10; echo $root->eval();
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught Error: Typed property Node::$rightChild must not be accessed before initialization in /in/4AJ5t:17 Stack trace: #0 /in/4AJ5t(31): Node->eval() #1 {main} thrown in /in/4AJ5t on line 17
Process exited with code 255.

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